According to reporting from Business Insider, a series of leading UK food retailers have said they will never sell chlorinated chicken, frustrating the efforts of those pushing for UK food standards to be lowered to finalise a trade agreement with the United States.

The US administration has insisted that its agricultural goods must be included in any free trade agreement between the two nations. However, the UK’s high food standards prohibit imports of many US products. The current UK administration hinted that it would drop the ban on these products once Britain leaves the EU trading bloc in 2021.

Business Insider reports that several supermarket chains say they would never stock the products, even if the rules were relaxed by the government.

Speaking to Business Insider last week, a spokesperson for Marks & Spencer said, “…our commitment to our customers and family of 10,000 British farmers has not and will not change. Our promise is that we only ever source our quality fresh food from Select Farmers we know and trust. That means our customers can be confident that we will never sell chlorinated chicken or hormone-treated beef.”

Read more about this story here.